20975234 has 12 divisors (see below), whose sum is σ = 36599814. Its totient is φ = 8989344.

The previous prime is 20975233. The next prime is 20975237. The reversal of 20975234 is 43257902.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13712209 + 7263025 = 3703^2 + 2695^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20975234.

It is not an unprimeable number, because it can be changed into a prime (20975233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106919 + ... + 107114.

Almost surely, 2^20975234 is an apocalyptic number.

20975234 is a deficient number, since it is larger than the sum of its proper divisors (15624580).

20975234 is a wasteful number, since it uses less digits than its factorization.

20975234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214049 (or 214042 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 20975234 is about 4579.8727056546. The cubic root of 20975234 is about 275.7839185999.

The spelling of 20975234 in words is "twenty million, nine hundred seventy-five thousand, two hundred thirty-four".